An R package implementing bee swarm plots
You can see some examples here: http://www.cbs.dtu.dk/~eklund/beeswarm/
You can install the latest release on CRAN like this:
install.packages("beeswarm")
Or you can install the latest development version from GitHub like this:
## install.packages("devtools")
devtools::install_github("aroneklund/beeswarm")
Leland Wilkinson (1999). Dot plots. The American Statistician. 53(3):276-281. PDF
It seems to be the same basic point layout algorithm, except that Wilkinson suggests an additional smoothing step that the beeswarm package does not do.